May 27, 2018

Real time Operating Systems - MCQS

Iney Reward with Increased Service
Increased Raw with Increased Service
Increased Reward with Increased Service
None of these

The correct answer is: Increased Reward with Increased Service

Question
Which of these is true about an open loop system vs closed loop system:

Closed loop systems are comparatively cheaper as they require less components & design effort
Open loop system provides better control in the presence of environmental disturbance
An open loop system can be made closed loop by introducing and controlling
A kitchen toaster is a closed loop system

The correct answer is: An open loop system can be made closed loop by introducing and controlling

Question
RTOS is ________ in nature

timely
memory oriented
high cpacity
non-accurate

The correct answer is: timely

Question
True for a task vis-à-vis a process?

Tasks are complex compared to processes
Tasks and processes are one and the same thing
Processes can spawn threads but tasks cannot spawn tasks
Tasks represent only a single sequence of instructions

The correct answer is: Tasks represent only a single sequence of instructions

Question
Cheddar is written in

Perl
Ada
Python

The correct answer is: Ada

Question
In real time operating system

kernel is not required
all processes have the same priority
process scheduling can be done only once
a task must be serviced by its deadline period

The correct answer is: a task must be serviced by its deadline period

Question
A RTOS is characterised by

Select one:
1. Kernel is not required
2. Same priority for all processes
3. A task must be serviced on time or before time
4. Single time process scheduling

The correct answer is: A task must be serviced on time or before time

Question

In which scheduling certain amount of CPU time is allocated to each process?

The acronym M2M application stands for Machine to Man applications
The acronym M2M application stands for Mobile to Mobile applications
The acronym M2M application stands for Machine to Machine applications
None of these

Select one:
must degrade over time
must not degrade over time
may degrade over time
none of the mentioned

Answer: must not degrade over time

Question.
What is jitter in Real-time terminology:

Select one:
Variation in a parameter. For example, variation in arrival rates, computation durations, or communication latencies.
An event with an arrival pattern that has a bounded minimum interarrival time with stochastic jitter.
The activation of a task such that it will be considered by the RTOS for execution on the CPU..
None of these

Answer: Variation in a parameter. For example, variation in arrival rates, computation durations, or communication latencies.

Question.
Scheduling of tasks is a very important consideration in RTOS. Which of the following best described the scheduling policy design:

Select one:
The scheduler must follow a pre-emptive policy
The scheduler must not use pre-emptive policy option
The scheduler must not only use pre-emptive policy options with the priority considerations.
The scheduler must not use pre-emptive policy option, but must employ priority consideration

Answer: The scheduler must not use pre-emptive policy option, but must employ priority consideration

Question.
Type of processor in which single task of a particular application is process is termed as

Select one:
A real time operating system (RTOS) is an operating system that guarantees a certain capability within a specified time constraint.
An OS is a system program that provides an interface between application programs and the computer system (hardware)
The applications where dependability that a certain task will finish before a particular deadline is just as obtaining the correct results.
Besides meeting deadlines RTOS must also be able to respond predictably to unpredictable events and process multiple events concurrently.
all of above

Answer: all of above

Question
In rate monotonic scheduling algorithm

Select one:
1. Shorter duration job has higher priority
2. Priority does not depend on the duration of the job
3. Longer duration job has higher priority
4. None of the mentioned

Answer: Shorter duration job has higher priority

Question.
Keeping a task’s schedulability in mind, which way a task may be scheduled

Select one:
The task has a predetermined time after which it may be scheduled.
The task has a predetermined time before which it may be scheduled
The task has a predetermined time interval during which it must be scheduled any time.
The task start has a worst case delay estimate before which it must be scheduled

Answer: The task has a predetermined time interval during which it must be scheduled any time.

Question.
Time duration required for scheduling dispatcher to stop one process and start another is known as

Question.
if jobs have unpredictable release times, a task is termed :

Select one:
aperiodic
sporadic
periodic.
None of these

Answer: aperiodic

Question.
Time required to synchronous switch from the context of one thread to the context of another thread is called

Select one:
threads fly-back time
jitter
context switch time
none of the mentioned

Answer: context switch time

Question.
Which of the following describes the RTOS design philiosophy best

Select one:
Maximize the throughput of the system
Maximize the processor utilization
Minimizing the response time
Response within certain stipulated time period

Answer: Minimizing the response time

Question.
Delay and Jitter :

Select one:
mean the same thing
are two completely different things
all of the mentioned
none of the mentioned

Answer: are two completely different things

Question.
IRIS Stand for :

Select one:
Increased Reward with Increased Service
Iney Reward with Increased Service
Increased Raw with Increased Service
None of these

Answer: Increased Reward with Increased Service

Question.
Which one of the following is a real time operating system?

Select one:
RTLinux
VxWorks
Windows CE
All of the mentioned

Answer: All of the mentioned

Question
IF jobs have unpredicted release times, then the jobs are called

Select one:
1. Periodic
2. Aperiodic
3. Regular
4. Sporadic

Answer: AperiodicQuestion.
In rate monotonic scheduling

Select one:
shorter duration job has higher priority
longer duration job has higher priority
priority does not depend on the duration of the job
none of the mentioned

Answer: shorter duration job has higher priority

Question.
The major difference between a multimedia file and a regular file is :

Select one:
the size
the attributes
the ownership
the rate at which the file must be accessed

Answer: the ownership

Question.
Rate monotonic scheduling assumes that the :

Select one:
processing time of a periodic process is same for each CPU burst
processing time of a periodic process is different for each CPU burst
periods of all processes is the same
none of the mentioned

Answer: processing time of a periodic process is same for each CPU burst.

Question.
System which processes the data instructions without any delay is classified as

Select one:
online system
offline system
instruction system
real time system

Answer: real time system

Question.
Delay is :

Select one:
the time from when a request is first submitted to when the desired result is produced
the delay that occurs during playback of the stream
how the errors are handled during transmission and processing of continuous media
none of the mentioned

Answer: the time from when a request is first submitted to when the desired result is produced

Question.
If a set of processes cannot be scheduled by rate monotonic scheduling algorithm, then :

Select one:
they can be scheduled by EDF algorithm
they cannot be scheduled by EDF algorithm
they cannot be scheduled by any other algorithm
none of the mentioned

Answer: they cannot be scheduled by EDF algorithm

Question.
Hard real-time system is A

Select one:
system with deadline is very Hard
system with stringent deadlines
system whose deadline is very hard to determine
System whose deadline is not so hard to determine

Answer: system with stringent deadlines

Question.
Which one of the following is the characteristic of a multimedia system?

Select one:
high storage
high data rates
both high storage and high data rates
none of the mentioned

Answer: both high storage and high data rates

Question.
Identify which of these are real-time applications scenarios:

Select one:
An on-line bus ticketing system
Printing of annual report of a company’s annual report
Reconciling a day’s transactions in an account book of a small company
An aircrafts yaw control system

Select one:
is the amount of time left after a job if the job was started now.
is the amount of time left before a job if the job was started now.
is the amount of time left from a job if the job was started now.
is the amount of time left required by a job if the job was started now.

Answer: is the amount of time left after a job if the job was started now

Question.
The delay that occur during the playback of a stream is called

Select one:
stream delay Incorrect
playback delay
jitter
event delay

Answer: jitter

Question
Hard real time operating system has ___ jitter than a soft real time operating system.
Select one:
1. More
2. Equal
3. None
4. Less

Answer: Less

Question
Which of the following is never a part of open loop control system

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